Toyota Tundra. Manual — part 1547

c. Turn the Techstream on.

d. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/MAF and Coolant

Temp.

e. Allow the engine to idle until the Coolant Temp reaches 75°C (167°F) or more.

f. Read the MAF with the engine in an idling condition and no load.

Standard: MAF while engine idling: Between 4 g/sec. and 8g/sec. (shift lever: N; A/C: OFF;
no electric load).

NG: REPLACE MASS AIR FLOW METER (See REMOVAL )

OK: Go to Next Step

4. READ VALUE USING TECHSTREAM (COOLANT TEMP)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Coolant Temp.

d. Read the Coolant Temp twice, when the engine is both cold and warmed up.

Standard: With cold engine: Same as ambient air temperature.

With warm engine: Between 75°C and 100°C (167°F and 212°F).

NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step

5. CHECK PCV HOSE CONNECTIONS

a. Check the PCV hose connections (see ON-VEHICLE INSPECTION ).

OK: PCV hose is connected correctly and is not damaged.

NG: REPAIR OR REPLACE PCV HOSE (See PCV VALVE )

OK: Go to Next Step

6. CHECK AIR INDUCTION SYSTEM

a. Check the air induction system for vacuum leakage (see ON-VEHICLE INSPECTION ).

OK: No leakage from air induction system.

NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK: Go to Next Step

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

7. CHECK FOR SPARKS AND IGNITION (See INSPECTION PROCEDURE )

NG: REPAIR OR REPLACE IGNITION SYSTEM

OK: Go to Next Step

8. CHECK FOR EXHAUST GAS LEAK

a. Check for exhaust gas leak.

OK: No gas leakage.

NG: REPAIR OR REPLACE EXHAUST SYSTEM

OK: Go to Next Step

9. CHECK FUEL LEAK

a. Check the fuel leak (see ON-VEHICLE INSPECTION ).

NG: REPAIR OR REPLACE FUEL LEAKAGE POINT

OK: Go to Next Step

10. INSPECT FUEL INJECTOR (INJECTION AND VOLUME)

a. Check the injection volume (see INSPECTION ).

NG: REPLACE FUEL INJECTOR (See REMOVAL )

OK: Go to Next Step

11. CHECK FUEL PRESSURE SWITCHING SYSTEM

a. Check the Fuel Pressure Switching System (see FUEL PRESSURE SWITCHING SYSTEM ).

HINT:

If the problem area cannot be determined by checking the fuel pressure switching system, proceed
to the next step.

12. INSPECT AIR-FUEL RATIO SENSOR (HEATER RESISTANCE) (See INSPECTION

PROCEDURE )

NG: REPLACE AIR FUEL RATIO SENSOR (See REMOVAL )

OK: Go to Next Step

13. INSPECT INTEGRATION RELAY (A/F RELAY) (See INSPECTION PROCEDURE )

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

NG: REPLACE INTEGRATION RELAY (See ON-VEHICLE INSPECTION )

OK: Go to Next Step

14. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) (See INSPECTION

PROCEDURE )

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

15. REPLACE AIR FUEL RATIO SENSOR

a. Replace the air fuel ratio sensor (see REMOVAL ).

16. PERFORM CONFIRMATION DRIVING PATTERN

Fig. 108: Vehicle Speed Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Clear the DTCs (See DTC CHECK/CLEAR ).

HINT:

Even if no DTCs are stored, perform the DTC clear operation to start alcohol concentration
learning.

e. Start the engine.

HINT:

After clearing the DTCs, the engine may become difficult to start if the concentration of alcohol in
the fuel is high.

Therefore, it may be necessary to crank the engine a few times before it starts.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

f. Warm it up until the ECT reaches 75°C (167°F) or higher [A].

g. Drive the vehicle at 32 km/h (20 mph) or more and maintain a constant speed for 2 minutes or more

[B].

h. Make sure that the Data List "Alcohol Density Learning" is "Compl".

i. Drive the vehicle at between 60 and 120 km/h (38 and 75 mph), at an engine speed of between

1400 and 3200 RPM, and maintain a constant speed for 5 minutes or more [C].

HINT:

If the system is still malfunctioning, pending DTCs are stored.

17. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174 OR P0175)

a. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

b. Read pending DTCs.

Result

RESULT REFERENCE

B: REPLACE ECM (See REMOVAL )

A: END

DTC P0230 FUEL PUMP PRIMARY CIRCUIT

DESCRIPTION

When a malfunction in the fuel pump circuit is detected, DTC P0230 is stored.

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump).
Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty
signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the
fuel pump operation speed between 3 settings. The fuel pump ECU also has a self-diagnosis function. Based on
the fuel pump circuit condition, the fuel pump ECU outputs a diagnostic signal (Dl) to the ECM, and the ECM
determines if there is a malfunction in the fuel pump circuit.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

CAUTION: Perform this drive pattern on a level road as much as possible

and strictly observe the posted speed limits and traffic laws
while driving.

Result

Proceed to

No DTC is output

A

P0171, P0172, P0174 or P0175 is output

B

DTC

DTC Detection Condition

Trouble Area

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra